CN102721959B - Millimeter wave monolithic integrated detector assembly - Google Patents

Abstract

The invention relates to a millimeter-wave single-chip integrated detector assembly, including a radio frequency voltage-controlled oscillator, a drive circuit, a low-noise amplifier, a mixer, and a transceiver antenna. The radio-frequency voltage-controlled oscillator is used to pass different voltages according to an external system. The wave type is adjusted to obtain a radio frequency signal; the drive circuit is used to amplify the generated radio frequency signal; the transceiver antenna is used to send the amplified radio frequency signal; the sent radio frequency signal generates an echo signal after encountering the detection object; The transceiver antenna is also used to receive the echo signal; the low noise amplifier is used to amplify the received echo signal; the mixer is used to mix the amplified echo signal and the local oscillator signal, Obtain the frequency difference between the transmission time and the radio frequency signal at the current time. The invention can detect the size of the object, and realize the measurement of the distance, speed and acceleration during the target detection process.

Description

Millimeter wave monolithic integrated detector assembly

technical field

The invention relates to the technical field of detectors, in particular to a millimeter-wave single-chip integrated detector component, which can be used in civil and national defense equipment such as liquid level detection, vehicle collision avoidance, and people flow counting.

Background technique

In practical system applications, it is often necessary to understand the target characteristics, distance characteristics and motion characteristics of external objects, and make corresponding decisions through the acquisition of these information and make differences. The millimeter-wave single-chip integrated detector component adopts the principle of radar detection, which can measure the reflected signal strength of the target object and the target distance in real time. The related information of speed and acceleration can be further obtained by differential processing of the distance information, which has the technical characteristics of real-time, accuracy and high reliability. These features can be widely used in civil fields such as the measurement of the liquid level, the measurement of the avoidance distance during the driving of the vehicle, and the statistics of the flow of people at the large bayonet. Millimeter waves also have a strong ability to penetrate smoke, fog, dust, etc., and have a strong anti-interference ability to radio, and have broad application prospects in the military field. However, the existing millimeter-wave monolithic integrated detector components cannot detect the size of the object, and measure the distance, velocity and acceleration during the target detection process.

Contents of the invention

The technical problem to be solved by the present invention is to provide a millimeter-wave single-chip integrated detector assembly, which can detect the size of objects and realize the measurement of distance, speed and acceleration during the target detection process.

The technical solution adopted by the present invention to solve the technical problem is to provide a millimeter-wave single-chip integrated detector assembly, including a radio frequency voltage-controlled oscillator, a drive circuit, a low-noise amplifier, a mixer, and a transceiver antenna. The controlled oscillator is used to obtain radio frequency signals through the adjustment of different voltage waveforms according to the external system; the drive circuit is used to amplify the generated radio frequency signals; the transceiver antenna is used to send the amplified radio frequency signals; the sent radio frequency After the signal meets the detection object, an echo signal is generated; the transceiver antenna is also used to receive the echo signal; the low noise amplifier is used to amplify the received echo signal; the mixer is used to amplify the echo signal The echo signal and the local oscillator signal are mixed to obtain the frequency difference between the transmission time and the radio frequency signal at the current time.

The transceiver antenna is a microstrip planar antenna.

The integrated structure of the RF voltage-controlled oscillator, drive circuit, low-noise amplifier, mixer and transceiver antenna; the RF chip of the RF voltage-controlled oscillator is bonded to the circuit board through silver paste, and the circuit board The pins are connected to the radio frequency pins of the radio frequency chip through gold wires; the back of the circuit board is grounded in a large area and is pasted and solidified with the silver paste on the back of the transceiver antenna.

Both the transceiver antenna and the circuit board are made of printed circuit materials and processed into a double-sided structure.

The front part of the transmitting and receiving antenna is provided with a shielding hole, and the boundary part of the transmitting and receiving antenna is welded with the steel needle of the probe as a pad, and the pad is connected with a lead wire; the transmitting and receiving antenna and the circuit board are at corresponding positions. There are steel pinholes and connecting through holes, and the lead wires are connected to the steel pinholes; the holes on the transceiver antenna and the corresponding holes on the circuit board are connected through metal wires by drying and curing silver paste.

The transmitting and receiving antenna is directly coupled by a feeder. The feeder of the transmitting and receiving antenna and the feeder of the circuit board maintain the corresponding position up and down, and through holes are opened at the ends of the two feeders. A metal wire is placed in the center of the through hole and passed through the silver paste. Dry cure connection.

The steel needles are arranged in a circular arc shape, and the steel needles are covered with a shielding cover with a plane opening. The end surface of the shielding cover is provided with a hole for the steel needles to pass through at the position corresponding to the steel needles. The position where the steel needle intersects with the shielding cover is isolated by an insulating sleeve, and the insulating sleeve is encapsulated by colloidal curing.

Beneficial effect

Due to the adoption of the above-mentioned technical solution, the present invention has the following advantages and positive effects compared with the prior art: the present invention actually integrates the millimeter-wave integrated detector assembly through the MCM process within the limited volume range, and the experiment proves that 20 Measurable within the range of meters, to achieve practical goals, with high reliability, product consistency and anti-interference ability, providing a guarantee for the realization of detection target distance measurement and speed measurement.

Description of drawings

Fig. 1 is a schematic front view of the circuit assembly of the millimeter-wave integrated detector assembly of the present invention;

Fig. 2 is a schematic diagram of the back of the antenna of the millimeter-wave integrated detector assembly of the present invention;

Fig. 3 is a schematic diagram of the back of the circuit assembly of the millimeter-wave integrated detector assembly of the present invention;

Fig. 4 is a front schematic diagram of the antenna of the millimeter-wave integrated detector assembly of the present invention;

Fig. 5 is an assembly diagram of the metal shielding shell of the millimeter wave integrated detector assembly of the present invention.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Embodiments of the present invention relate to a millimeter-wave monolithic integrated detector assembly, as shown in Figures 1-4, including a radio frequency voltage-controlled oscillator, a drive circuit, a low-noise amplifier, a mixer, and a transceiver antenna. The voltage-controlled oscillator is used to obtain radio frequency signals through the adjustment of different voltage waveforms according to the external system; the drive circuit is used to amplify the generated radio frequency signals; the transceiver antenna is used to send the amplified radio frequency signals; The radio frequency signal generates an echo signal after encountering the detection object; the transceiver antenna is also used to receive the echo signal; the low noise amplifier is used to amplify the received echo signal; the mixer is used to amplify the The echo signal and the local oscillator signal are mixed to obtain the frequency difference between the transmission time and the radio frequency signal at the current time.

The external modulation circuit is connected to the pressure regulating pin of the voltage-controlled oscillator to generate radio frequency signals with different frequency components, and the radio frequency signals are connected to the driver chip through gold wires to increase the transmission power. After the high-power radio frequency signal passes through the power divider, one way is sent to the antenna for transmission, and the other way is sent to the mixer as a mixing signal. The low-noise amplifier amplifies the echo signal reflected by the object received by the receiving antenna, and sends the output signal to the mixer. The mixer mixes the local oscillator signal separated by the power divider with the echo signal received by the low noise amplifier. After the mixed frequency signal is amplified by an emitter follower, the driving ability and isolation of the signal are improved, and the mixed frequency signal contains information such as the speed and distance of the target.

This device uses the circuit part and the antenna part to be processed separately, and the two are connected by silver paste bonding. Both the circuit and the antenna are made of high-frequency printed circuit material with a small dissipation factor, and are processed into a double-sided structure, one of which is a common ground. When bonding, the antenna and the ground part of the circuit are back-attached to maintain good grounding characteristics and heat dissipation characteristics. The integrated structure of the RF voltage-controlled oscillator, drive circuit, low-noise amplifier, mixer and transceiver antenna; the RF chip 2 of the RF voltage-controlled oscillator is bonded to the circuit board 1 through silver paste, and the circuit The pins of the board 1 and the radio frequency pins of the radio frequency chip 2 are connected through gold wires 3; Described transceiver antenna 4 adopts the direct coupling of feeder line mode, and the feeder line 8 of described transceiver antenna 4 and the feeder line of circuit board 1 keep the corresponding position up and down, and open through hole at two feeder line ends, and described through hole center places metal wire and passes through After the silver paste is dried and solidified, the connection is made.

The connection points of the power supply and the signal around the circuit are welded by steel pins, and the positions of the through holes of the circuit and the pad holes around the antenna are required to maintain a corresponding and consistent relationship. In addition, a small through hole is opened on the side of the antenna pad and the pin corresponding to the circuit and connected to the pin. Thread a metal wire through the center of the two small through holes and dry the connection through the silver paste to ensure the reliability of the connection between the circuit and the power signal pin. The front part of the transceiver antenna 2 is provided with a shielding hole 5, and the boundary part of the transceiver antenna 2 is welded with the steel needle 10 of the probe as a pad, and the pad is connected with a lead wire; the transceiver antenna 2 and the circuit board 1 Corresponding positions are provided with steel pinholes 6 and connecting through holes 7, and the leads are connected to the steel pinholes 6; the holes on the transceiver antenna 2 and the holes corresponding to each other on the circuit board 1 are made of silver through metal wires. The slurry is dried and solidified to connect.

As shown in Figure 5, the steel needles 10 are arranged in a circular arc shape, and the steel needles 10 are covered with a shielding cover 9 with a plane opening. For the hole through which the steel needle passes, an insulating sleeve is provided at the position where the steel needle 10 intersects with the shielding cover 9 to isolate, and the insulating sleeve is encapsulated by colloidal curing. That is to say, the detector assembly is shielded by a short cylindrical metal shell with an opening on one side, and a hole is punched at the corresponding position of the steel needle on the other side of the cylinder to allow the steel needle to pass through, and insulation treatment is taken at the intersection of the steel needle and the cylindrical surface. Car out the step at the opening of the short cylinder and ground the ground plane on the back of the circuit to ensure that the probe shell is grounded.

In the present invention, the millimeter-wave integrated detector assembly is actually integrated through the MCM process within a limited volume range. The experiment proves that it can be measured within a range of 20 meters, achieves practical goals, and has high reliability, product consistency and anti-interference ability. It provides a guarantee for the realization of the distance measurement and speed measurement of the detection target.

Claims (3)

1. a millimeter-wave monolithic integrated detector assembly, comprise RF Voltage-Controlled Oscillator, driving circuit, low noise amplifier, frequency mixer and dual-mode antenna, it is characterized in that, described RF Voltage-Controlled Oscillator is used for obtaining radiofrequency signal according to external system by the adjustment of different voltage waveforms; The radiofrequency signal that described driving circuit is used for producing is amplified; Described dual-mode antenna is for sending the radiofrequency signal after amplification; The radiofrequency signal sent out produces echoed signal after running into detection thing; Described dual-mode antenna is also for receiving described echoed signal; Described low noise amplifier is for amplifying the echoed signal received; Described frequency mixer is used for the echoed signal after by amplification and local oscillation signal carries out mixing, obtains the frequency difference of the radiofrequency signal of launch time and current time; Described dual-mode antenna is micro-band flat plane antenna; Described RF Voltage-Controlled Oscillator, driving circuit, low noise amplifier, frequency mixer and being integrally formed of dual-mode antenna structure; The radio frequency chip (2) of described RF Voltage-Controlled Oscillator is bonded on circuit board (1) by silver slurry, and the pin of circuit board (1) is connected by spun gold (3) with the radio frequency pin of described radio frequency chip (2); The back side large area ground connection of described circuit board (1) is also starched to paste by silver with the back side of described dual-mode antenna (2) and is solidified; Described dual-mode antenna (2) adopts feeder line mode direct-coupling, the feeder line (8) of described dual-mode antenna (2) and the feeder line of circuit board (1) keep upper and lower correspondence position, and offer through hole at two feeder line ends, described through hole center is placed tinsel and is connected by the solidification of silver slurry post-drying; Described dual-mode antenna (2) front portion is provided with shield opening (5), and the boundary member of described dual-mode antenna (2) welds with draw point as pad, and described pad connects leaded; Described dual-mode antenna (2) and circuit board (1) are equipped with steel pinhole (6) and connecting through hole (7) in corresponding position, described lead-in wire is connected with steel pinhole (6); The mode that described dual-mode antenna (2) adopts silver to starch baking and curing with the upper mutually corresponding steel pinhole (6) of circuit board (1) and connecting through hole (7) respectively by tinsel connects.

2. millimeter-wave monolithic integrated detector assembly according to claim 1, is characterized in that, described dual-mode antenna (2) and circuit board (1) all adopt printed wire material make and be processed into bilateral structure.

3. millimeter-wave monolithic integrated detector assembly according to claim 1, it is characterized in that, described draw point (10) arrangement is in circular arc, described draw point (10) overcoat has the screening cover (9) of plane opening, the end face of described screening cover (9) is provided with the hole for making described draw point (10) pass through in the position that described draw point (10) is corresponding, the position that described draw point (10) and described screening cover (9) intersect is provided with insulating sleeve and isolates, and described insulating sleeve is by colloid cure package.